GB/T 6379.6-2009Accuracy (trueness and precision) of measurement methods and results -- Part 6: Use in practice of accuracy values (English PDF)

Foreword

GB/T 6379 Accuracy (Trueness and Precision) of Measurement Methods and Results

can be divided into the following 6 parts.

--- Part 1.General Principle sand Definitions (ISO 5725-1.1994, IDT);

--- Part 2.Basic Method for the Determination of Repeatability and Reproducibility

of a Standard Measurement Method (ISO 5275-2.1994, IDT);

--- Part 3.Intermediate Measures of the Precision of a Standard Measurement

Method (ISO 5275-3.1994, IDT);

--- Part 4.Basic Methods for the Determination of the Trueness of a Standard

Measurement Method (ISO 5275-4.1994, IDT);

--- Part 5.Alternative Methods for the Determination of the Precision of a Standard

Measurement Method (ISO 5275-5.1998, IDT);

--- Part 6.Use in Practice of Accuracy Values (ISO 5275-6.1994, IDT).

This Part belongs to Part 6 of GB/T 6379.

This Part equivalently adopted the international standard ISO 5275-6.1994 Accuracy

(Trueness and Precision) of Measurement Methods and Results – Part 6.Use in

Practice of Accuracy Values and Technical amendments of ISO 5275-6 (Edition 1994)

issued on October 15, 2001 by ISO. Corrections to the ISO 5275-6.1994 are as follows.

--- According to the calculation results, redraw the Figure 10;

--- x1 is added up to 16.84 in the original Table 6, which is wrong, and shall be

corrected into 16.74.

The Part 1 to Part 6 of GB/T 6379 as a whole replaced GB/T 6379-1986 and GB/T

11792-1989.The concept of original precision is extended in the standard, add the

concept of trueness, which is called accuracy; in addition to the repeatability and

reproducibility conditions, add the intermediate precision conditions.

The contents of this Part replaced GB/T 6379-1986 and GB/T 11792-1989 partially.

The Appendix A of this part is normative.

This Part was proposed by Guangdong Entry-Exit Inspection and Quarantine Bureau.

This Part shall be under the jurisdiction of National Technical Committee on Application

of Statistical Methods of Standard Administration of China.

Drafting organizations of this Part. Guangdong Entry-Exit Inspection and Quarantine

Bureau, Academy of Mathematics and System Science of Chinese Academy of

Sciences, and China National Institute of Standardization.

Chief drafting staffs of this Part. Li Chengming, Feng Shiyong, Zhang Zhenkun, Jiang

Jian, Zhou Qi, Ding Wenxing, Song Wuyuan, Yu Zhenfan, Li Zhengjun, Xiao Hui, Liu

Jianbin, and Chen Yuzhong.

This Part was first-time published in 2009.

1 Scope

It is assumed that the estimates of trueness and precision for the method have

been obtained in accordance with parts 1 to 5 of GB/T 6379.

Any additional information regarding the field of application will be given at the

beginning of each particular application.

2 Normative References

The provisions in following documents become the provisions of this Standard through

reference in this Part of GB/T 6379.For dated references, the subsequent

amendments (excluding corrigendum) or revisions do not apply to this Standard,

however, parties who reach an agreement based on this Standard are encouraged to

study if the latest versions of these documents are applicable.

3 Terms and Definitions

For the purposes of this Part of GB/T 6379, the terms and definitions given in GB/T

4 Determination of Limits

6 Method for Checking the Stability of Test Results within a Laboratory

It is difficult to check the trueness of a test result if there is no RM. However, in practice,

in many cases a test result obtained by a skilled operator in a well-equipped laboratory

following a standard measurement method (or preferably a "definitive" method) strictly,

thoroughly and carefully, can be used as a reference value in place of the certified

value.

7 Use of Repeatability and Reproducibility Standard Deviation in Assessing Laboratories

This clause describes assessment of laboratories with regard to only a single

measurement method which is standardized and which is in use in various laboratories.

Consequently, it is possible to estimate the precision of the method in the form of the

repeatability and the reproducibility standard deviations. It is assumed that these

8 Comparison of Alternative Measurement Methods

The comparison between methods A and B shall be made on the results of precision

experiments. If method A is a well-established standard method, the precision of

method A can be used as the basis for comparison.

The accuracy experiment shall be conducted in accordance with the general rules

described in GB/T 6379.1.

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